Method of making annular objects



6,1932- c. P cHAMBERLlN 1,839,773

METHOD OF MAKING ANNULAR OBJECTS Filed June 8, 1932 INVENTOR /0W Iew ATTORNEY Patented Dec. 6, 1932 1J1-1m:.o STATES PATIENT oFFIcs CLARENCE P. CERLIN, F DETROIT, MICHIGAN nnrnon or name amwnaa onmc'rs Application filed June 8,1932. Serial No. 616,137. r

in which Fig. 1, shows an annular object, in.

face view, having a molding applied b the method of the invention, the molding ing shown broken away in part.

Fig. 2 shows a molding in the condition it has before it is applied to the object, and Figs. 3 and 4 are sections on lines 33 and l4.- of Figs. 1 and 2 res ectively, rolling devwioes being also shown iagrammatically in fin the drawing, Fig. 1 shows, in face view, a tire cover having a pliable material face ring provided with seams or beads. 11

and 12 forming beaded annuli at the inner and outer edges of the same. The beaded annulus at head 12 is shown as covered by a molding 1 1 of 6 cross section (Fig. 3), and applied by the method of the invention and how to be described.

Before the molding is applied to thebead 12, it is rolled so as to have a tendency to assume a diameter (D+m) slightly greater than the diameter (d) of the beaded annulus of head 12, the circumferential length of the 39 molding'being substantially equal to the circumferential length of the beaded annulus oi bead 12. r

The molding at this time is open, in crosssection '(Fig. 9) to such an extent that it can receive the head 12.

One end of the molding, in its expanded state and its open cross-section condition is then applied to the annulus of head 12. The head 12 and the aforementioned end of the 49 molding is then brought between the separated rolls 1515 of a conventional pressure rolling machine. The rolls are then-moved towards each other and then rotated, thus crimping or rolling the molding onto the bead 12, the moldlng assuming the cross section of Fig. 3. This rolling step causes the molding to contact from its original diameter (D+ar) to the diameter (D) of the beaded annulus of bead'12, in opposition to the inherent tendency of the molding to expand to its ori lnal diameter.

t is preferred to have the molding of a length slightly greater than the circumferential length of the annulus of bead 12, so

that when the molding is rolled onto the bead, a slight overlap, indicated by dotted lines in Fig. 1, will be provided.

It is also preferred though not absolutely essential, to roll the moldingonto head 12 in such a manner that the molding will be relatively loose thereon though non-removable therefrom as shown in Fig. 3. The molding is not clinched into the material, and may slide on the head; this revents the molding from causing the plia le material of the cover from puckering, binding, etc.

The use of a molding ring having an inherent tendency to expand to a diameter greater than its finished diameter eliminates the tendency of the ring1 to warp and wave out of a true plane. it as been .iound that when the ring is so formed as not to have the expandin tendency aforementioned, it warps an waves out of its plans and mars the desired flat appearance of the annular finished line.

Now having described the invention, and embodiments thereof, it will be observed that the same is not to be limited to the specific details shown, but only by the scope of the claims which follow.

hat I claim is:

1. The method of applying a molding of 3 cross section to an annular seam or head in an object of pliable material which comprises providing a length of the molding substantially equal to the circumferential length of the seamed or beaded annulus, and having an inherent tendency to expand to a diameter greater than. the diameter pi the seamed or beaded annulus, and applymg the molding onto the seam or head and contracting/it to the diameter of the seamed or beaded annulus, in opposition to the inherent tendency of the molding to expand to its original diameter.

2. The method of applying a molding of C cross section to an annular seam or bead in an object of pliable material which comprises roviding a length of the molding substantia y equal to the length of the seam or bead, and having an inherent tendency to expand to a diameter greater than the diameter of the seamed or beaded annulus, and applying the molding onto the seam or bead and contractin it to the diameter of the seamed or bea ed annulus, in op osition to the inherenttendency of the mol in to expand to its original dlameter, the mol 'n -.being so loosely applied to the seam or [ad that, though non-removable therefrom it does not clinch, bind, or pucker the pliable material.

In testimony whereof I afiix my si ature.

CLARENCE P. CHAMBE LIN. 

